Re: [RFC][PATCH] SCHED_ISO for interactivity

Daniel Phillips (
Sun, 13 Jul 2003 22:03:55 +0200

On Saturday 12 July 2003 17:49, William Lee Irwin III wrote:
> On Fri, Jul 11, 2003 at 08:53:38PM +1000, Con Kolivas wrote:
> > Wli coined the term "isochronous" (greek for same time) for a real time
> > task that was limited in it's timeslice but still guaranteed to run. I've
> > decided to abuse this term and use it to name this new policy in this
> > patch. This is neither real time, nor guaranteed.
> I didn't coin it; I know of it from elsewhere.

Right, for example, USB has an isochronous transfer facility intended to
support media applications, e.g., cameras, that require realtime
bandwidth/latency guarantees. The thing is, such guarantees have to be
end-to-end in the media pipeline. Sound is just one of the applications that
needs the kind of realtime support we (or more properly, Davide) just



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